recalc.varFunc {nlme} | R Documentation

## Recalculate for varFunc Object

### Description

This method function pre-multiples the `"Xy"` component of `conLin` by a diagonal matrix with diagonal elements given by the weights corresponding to the variance structure represented by `object`e and adds the log-likelihood contribution of `object`, given by `logLik(object)`, to the `"logLik"` component of `conLin`.

### Usage

    ## S3 method for class 'varFunc':
    recalc(object, conLin, ...)

### Arguments

`object` | an object inheriting from class `varFunc`, representing a variance function structure.
`conLin` | a condensed linear model object, consisting of a list with components `"Xy"`, corresponding to a regression matrix (`X`) combined with a response vector (`y`), and `"logLik"`, corresponding to the log-likelihood of the underlying model.
`...` | some methods for this generic require additional arguments. None are used in this method.

### Value

the recalculated condensed linear model object.

### Note

This method function is only used inside model fitting functions, such as `lme` and `gls`, that allow heteroscedastic error terms.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`varWeights`, `logLik.varFunc`

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